Effect of Web Height on Mechanical Properties of Simply Supported Channel Beam
Taking the concrete simply supported channel beam with a span of 48.5 m in Section B of the UAE Rail-way Phase Ⅱ project as the engineering background,the influence of web height change on the spatial mechanical be-havior of the heavy haul railway,such as space deformation,bidirectional force in the roadbed slab and shear hystere-sis effect was discussed with respect to the use of variable cross-section to adapt to the force demands of large spans and heavy loads.Midas FEA NX software was used to establish four kinds of space solid finite element models of channel beams with different parameters of variable cross-section,and the working conditions of self-weight+sec-ond-phase constant load,pre-stressing,and single-line and double-line train loads etc.were analyzed.The results indi-cate that increasing the height of the side webs can reduce the vertical deflection of the channel beam track slab,but it will increase the inward tilt deformation of the upper flange of the webs;the opposite is true under the action of prestress load.For the stress on the channel beam track slab,the higher the web height,the lower the longitudinal stress on the track slab,but there is no significant impact on the transverse stress.Under vertical load,the closer to the span centre position,the more obvious shear hysteresis effect.Under prestressing load,the influence of the change of web height on the shear hysteresis effect depends on the location of the prestressing tendon arrangement;when it is only arranged in the web,the shear hysteresis effect won't be affected by the web height.
heavy haul railwaychannel beamweb heightspatial mechanical performanceshear lag effect
万方数据
维普
